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import sys t = int(input().strip()) for a0 in range(t): n = int(input().strip()) three=(n-1)//3 five=(n-1)//5 fifteen=(n-1)//15 print((3*(three*(three+1)//2)+5*(five*(five+1)//2)-15*(fifteen*(fifteen+1)//2)))
Project Euler #1: Multiples of 3 and 5
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